CN103231209A - Method for producing vacuum-embedded metallurgical composite bimetal seamless tube - Google Patents

Method for producing vacuum-embedded metallurgical composite bimetal seamless tube Download PDF

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Publication number
CN103231209A
CN103231209A CN2013101247670A CN201310124767A CN103231209A CN 103231209 A CN103231209 A CN 103231209A CN 2013101247670 A CN2013101247670 A CN 2013101247670A CN 201310124767 A CN201310124767 A CN 201310124767A CN 103231209 A CN103231209 A CN 103231209A
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China
Prior art keywords
pipe
vacuum
tube
metallurgical
layer
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Pending
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CN2013101247670A
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Chinese (zh)
Inventor
武贤
王黎晖
周延峰
李仲华
申勇
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Xinxing Ductile Iron Pipes Co Ltd
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Xinxing Ductile Iron Pipes Co Ltd
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Priority to CN2013101247670A priority Critical patent/CN103231209A/en
Publication of CN103231209A publication Critical patent/CN103231209A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for producing a vacuum-embedded metallurgical composite bimetal seamless tube. The method comprises the steps of: abrasively machining an inner surface of a tube blank at the outer layer and an outer surface of a tube blank at the inner layer; performing intermediate-frequency inductive heating on the tube blank at the outer layer in a vacuum state; embedding the tube bank at the inner layer into the tube blank at the outer layer rapidly in an interference manner, cooling to less than 100 DEG C and then breaking the vacuum state and taking the tube blank out; sealing a beveled edge by soldering in a heat state; machining to form an extruded tube blank; and machining to form the metallurgical composite bimetal seamless tube after thermal expansion and thermal extrusion. The method for producing the vacuum-embedded metallurgical composite bimetal seamless tube has the beneficial effects that: the manufacturing cost of the extruded tube blank is lowered greatly, and the metallurgical bonding force can be completely satisfied with the use requirements as no waste product is generated in the manufacturing operation; high metallurgical bonding degree is achieved as no crack or layering is generated in flattening and bending operations; in addition, based on different materials of the inner layer and the outer layer, the vacuum-embedded metallurgical composite bimetal seamless tube can be satisfied with rigorous working conditions such as corrosion resistance and heat transfer, and is also a substitute product for monometallic expensive tubular products.

Description

The metallurgical bimetal composite seamless pipe production method of vacuum edge cover
Technical field
The present invention relates to metallurgical multiple tube manufacturing technology field.
Background technology
At present, the production technology of bimetal tube has a variety of, and production technology commonly used mainly contains coating, built-up welding, explosive welding (EW), centrifugal compound, compound soil weld etc., and above-mentioned several production technologies all have its corresponding deficiency and defective.Such as having the gap between the ectonexine that coats bimetal tube, do not realize real metallurgical binding, because the employed two kinds of material thermal expansion coefficient differences of ectonexine metal tube, therefore can't guarantee to use safely under the thermal environment being subjected to; Built-up welding bimetal tube production efficiency is extremely low, and production cost is very high; The production process safety coefficient of explosive welding (EW) bimetal tube is lower, have very strong noise pollution, and can't reach comprehensive metallurgical binding, the adhesion between the ectonexine metal tube is little, easily crack or layering when flattening or bending, bring difficulty for construction or device fabrication; Compound soil weld has sealing, influences the pipe performance; Though centrifugal casting is metallurgical binding fully, can production metallurgy after hot extrusion in conjunction with the bimetallic seamless pipe, be the new technology of present production metallurgy composite bimetal pipe.But centrifugal pipe composition of layer and size in when cast is wayward, and percent defective is higher, so manufacturing cost is very high.
Summary of the invention
The technical problem to be solved in the present invention provides the right height of a kind of metallurgical junction, the metallurgical bimetal composite seamless pipe production method of serviceability is good, yield rate is high, production cost is low vacuum edge cover.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The metallurgical bimetal composite seamless pipe production method of a kind of vacuum edge cover, its step is as follows:
(1) the ectonexine metal pipe of selection respective material, size carries out grinding with the inner surface of outer pipe and the outer surface of internal layer pipe then;
(2) the outer pipe after the above-mentioned grinding and internal layer pipe are placed under the vacuum state immediately, then outer pipe are carried out Frequency Induction Heating;
(3) rapidly internal layer pipe interference edge is packed in the outer pipe, the ectonexine pipe that the interference edge is packaged cools off, and vacuum breaker takes out then;
(4) under hot state, the groove that ectonexine pipe two ends are processed carries out sealing;
(5) the ectonexine pipe after the sealing is processed into extrusion tube blank;
(6) the above-mentioned extrusion tube blank that processes is expanded, after the hot extrusion, is processed into metallurgical bimetal composite seamless pipe through heat.
The material of described internal layer pipe is mild steel, low-alloy steel, stainless steel or nickel-base alloy, and the material of described outer pipe is mild steel, low-alloy steel, stainless steel or nickel-base alloy; Heating-up temperature in the described step (2) is 100 ℃~500 ℃; Chilling temperature in the described step (3) is below 100 ℃.
The magnitude of interference of interference edge cover is determined according to the thermal coefficient of expansion of ectonexine pipe in the described step (3), and when internal layer pipe material coefficient of thermal expansion coefficient during greater than outer blank tube material, lower limit is measured in interference; When outer pipe material coefficient of thermal expansion coefficient during greater than the internal layer blank tube material, strengthen the magnitude of interference.
The mating surface two ends car chamfering of outer pipe is also included in the described step (1).
In the above-mentioned steps (3) when outer pipe material coefficient of thermal expansion coefficient during greater than the internal layer blank tube material, strengthen the magnitude of interference, increase the magnitude of interference in principle and must not surpass outer field district clothes intensity, that is to say, must not make the outer plastic deformation that produces, so general maximum interference amount is no more than 0.3~0.4mm.
Beneficial effect of the present invention is as follows:
(1) the present invention adopts the method for machining, interference edge cover to make extrusion tube blank, and manufacturing process does not produce waste product, greatly reduces the cost of manufacture of extrusion tube blank, and its metallurgical junction can satisfy instructions for use with joint efforts fully; Production process degree of safety height.
(2) adopt inside and outside pipe interference fit under the vacuum condition, the interface at sealing two ends, the method for heat expansion then, extruding is produced the bimetallic seamless pipe, and its ectonexine pipe gets adhesion can reach 240MPa, flattening, bending all do not crack or layering the right height of metallurgical junction; In addition, according to the difference of ectonexine material, can satisfy harsh working conditions such as corrosion-resistant, heat exchange, also be the substitute products of the valuable tubing of monometallic.
The specific embodiment
Embodiment 1
Make 304L/20g bimetallic seamless steel pipe, outer pipe 304L is corrosion-resistant, internal layer pipe 20g good heat conductivity, and save valuable alloy material, and require metallurgy compound, be applicable to outer corrosion resistant, and the operating mode of heat exchange is arranged.
Outer pipe 304L adopts the spun casting pipe, and the internal layer pipe adopts the 20g continuous casting material.Because the thermal coefficient of expansion of outer pipe 304L is greater than internal layer pipe 20g, as calculated, the most rational magnitude of interference is 0.25~0.35mm.
After the ectonexine pipe processes, in 1 hour, earlier outer pipe is placed in the induction coil, lifts the internal layer pipe then, carry out the location; Whole hoisting process is noted the pure of fitting surface, must not have pollutants such as spot, grease, oxide to exist; Vacuumize then, treat vacuum reach-when 0.05MPa was following, induction coil sent electrical heating, adopted the far infrared thermometric in whole eddy-current heating process; When outer pipe internal surface temperature reached more than 350 ℃, the internal layer pipe slowly fell, after direction is reserved, and quick suit; After edge cover is finished, the induction coil cooling that has a power failure, when the pipe temperature is cooled to below 100 ℃, the ectonexine pipe is in conjunction with after firmly, and vacuum breaker hangs out the ectonexine pipe from induction coil, and with the interface groove soldering and sealing of ectonexine pipe two ends; Behind the cool to room temperature, processing endoporus and outer surface, polishing processing back becomes extrusion tube blank.
Above-mentioned extrusion tube blank heats in annular furnace, and pre-reaming after heat is squeezed into seamless steel pipe.
Embodiment 2
Make 8028/16Mn bimetallic seamless steel pipe, replace monometallic 8028 seamless pipes.Outer pipe 8028 is nickel-base alloy, high corrosion resistance, and the internal layer pipe is 16Mn, saves valuable alloy material, guarantees mechanical performance.
Outer pipe 8028 adopts squeezing seamless pipe, and internal layer pipe 16Mn adopts and forges bar.Because the thermal coefficient of expansion of outer pipe 8028 is greater than internal layer pipe 16Mn, as calculated, the most rational magnitude of interference is 0.2~0.3mm.
304L/20g among edge cover process and the embodiment 1 is basic identical.All be that hot charging is joined under vacuum state, after the soldering and sealing, cool to room temperature, processing endoporus and outer surface, polishing processing back becomes extrusion tube blank.
Above-mentioned extrusion tube blank heats in annular furnace, need not pre-reaming, directly adds to be hot extruded into seamless steel pipe.
Embodiment 3
Make 20#/316L bimetallic seamless steel pipe, 316L is corrosion-resistant for the internal layer pipe, and outer pipe 20# saves valuable alloy material, and this tubing is applicable to carries the active sulfur body medium.
The outer 20# continuous casting billet that adopts, internal layer 316L adopts forging stock.Because the thermal coefficient of expansion of outer pipe 20# is less than internal layer pipe 316L, the magnitude of interference is 0.05~0.15mm.
Edge cover process is substantially the same manner as Example 1, also is that hot charging is joined under vacuum state.Be that outer pipe heating-up temperature is on the low side, being heated to 100~200 ℃ can assemble, cool to room temperature, and processing endoporus and outer surface, polishing processing back becomes extrusion tube blank.
Above-mentioned extrusion tube blank heats in annular furnace, need not pre-reaming, directly adds to be hot extruded into seamless steel pipe.

Claims (4)

1. a vacuum edge overlaps metallurgical bimetal composite seamless pipe production method, it is characterized in that its method step is as follows:
(1) the ectonexine metal pipe of selection respective material, size carries out grinding with the inner surface of outer pipe and the outer surface of internal layer pipe then;
(2) the outer pipe after the above-mentioned grinding and internal layer pipe are placed under the vacuum state immediately, then outer pipe are carried out Frequency Induction Heating;
(3) rapidly internal layer pipe interference edge is packed in the outer pipe, the ectonexine pipe that the interference edge is packaged cools off, and vacuum breaker takes out then;
(4) under hot state, the groove that ectonexine pipe two ends are processed carries out sealing;
(5) the ectonexine pipe after the sealing is processed into extrusion tube blank;
(6) the above-mentioned extrusion tube blank that processes is expanded, after the hot extrusion, is processed into metallurgical bimetal composite seamless pipe through heat.
2. vacuum edge according to claim 1 overlaps metallurgical bimetal composite seamless pipe production method, it is characterized in that, the material of described internal layer pipe is mild steel, low-alloy steel, stainless steel or nickel-base alloy, and the material of described outer pipe is mild steel, low-alloy steel, stainless steel or nickel-base alloy; Heating-up temperature in the described step (2) is 100 ℃~500 ℃; Chilling temperature in the described step (3) is below 200 ℃.
3. vacuum edge according to claim 2 overlaps metallurgical bimetal composite seamless pipe production method, it is characterized in that, the magnitude of interference of interference edge cover is determined according to the thermal coefficient of expansion of ectonexine pipe in the described step (3), when internal layer pipe material coefficient of thermal expansion coefficient during greater than outer blank tube material, lower limit is measured in interference; When outer pipe material coefficient of thermal expansion coefficient during greater than the internal layer blank tube material, strengthen the magnitude of interference.
4. the metallurgical bimetal composite seamless pipe production method of vacuum edge cover according to claim 1 is characterized in that the mating surface two ends car chamfering of the outer pipe that also included in the described step (1).
CN2013101247670A 2013-04-11 2013-04-11 Method for producing vacuum-embedded metallurgical composite bimetal seamless tube Pending CN103231209A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103481033A (en) * 2013-09-25 2014-01-01 新兴铸管股份有限公司 Manufacturing method for double-metal seamless steel pipe through machining, assembling and extruding
CN104384859A (en) * 2014-12-05 2015-03-04 邯郸新兴特种管材有限公司 Production method for nickel base alloy N06625 composite seamless steel pipe
CN105150608A (en) * 2015-10-23 2015-12-16 湖南三泰新材料股份有限公司 Stainless steel/carbon steel bi-metal thread steel and composite molding technology thereof
CN105252843A (en) * 2015-10-23 2016-01-20 湖南三泰新材料股份有限公司 Stainless steel-carbon steel doublemetal channel steel and composite molding technology thereof
CN111589857A (en) * 2019-06-05 2020-08-28 天津市宁河县隆昌异型轧钢厂 Manufacturing method of hot-rolled composite steel and hot-rolled composite steel

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US5447179A (en) * 1990-05-18 1995-09-05 Itt Corporation Non-corrosive double-walled steel tube characterized in that the steel has a face-centered cubic grain structure
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103481033A (en) * 2013-09-25 2014-01-01 新兴铸管股份有限公司 Manufacturing method for double-metal seamless steel pipe through machining, assembling and extruding
CN104384859A (en) * 2014-12-05 2015-03-04 邯郸新兴特种管材有限公司 Production method for nickel base alloy N06625 composite seamless steel pipe
CN105150608A (en) * 2015-10-23 2015-12-16 湖南三泰新材料股份有限公司 Stainless steel/carbon steel bi-metal thread steel and composite molding technology thereof
CN105252843A (en) * 2015-10-23 2016-01-20 湖南三泰新材料股份有限公司 Stainless steel-carbon steel doublemetal channel steel and composite molding technology thereof
CN111589857A (en) * 2019-06-05 2020-08-28 天津市宁河县隆昌异型轧钢厂 Manufacturing method of hot-rolled composite steel and hot-rolled composite steel
CN111589857B (en) * 2019-06-05 2021-05-18 天津市宁河县隆昌异型轧钢厂 Manufacturing method of hot-rolled composite steel and hot-rolled composite steel

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